Tektronix 570, Manual

Page: 3 / 134

Displays Family of Curves on CRT Screen
Four to twelve characteristic curves per family.
Plots All Important Charac:teristics
Plote current against plate or grid voltage.
Screen current against plate or grid voltage.
Grid current against plate or grid voltage.
Positive-Bias Curves
Plots up to
8
positive-bias curves per family.
( up to 12 negative' bios curves)
Calibrated Controls
Accurate current and voltage readings directly from
the crt screen.
Wide Display Range
11 current ranges from 0.02 mo/div fo 50 ma/div.
9 voltage ranges from 0.1 v/div to 50 v/div.
11 series-load resistors from 300 ohms to 1 megohm.
7
grid-step values from 0.1 v/step to 10 v/step.
The Tektronix Type 570 Characteristic-Curve Tracer
presents an accurate graphic analysis of electron-tube
characteristics under almost any conceivable operating
conditions. Circuit design con now be tailored to more
closely fit the operating characteristics of available
tubes. Tubes con be selected foster and more accurately
for circuits requiring other than overage electron-tube
choracteristics. Two-socket arrangement with front-panel
switching permits rapid comparisons between two tubes,
or two sections of the same tube. Rapid comparisons
can be made with preselected curves outlined on a crt
mask. Patch-cord connector system with socket-adopter
plates enables complete control of operating-condition
setup.
The Type 570 is also on excellent tool for the instruc­
tor in electronics, both in the classroom and in the
laboratory.
CATHODE·RAY·TUBE DISPLAY
Positioning-Concentric controls provide for both
vertical and horizontal positioning of the display.
Vertical Axis-Concentric controls provide for se­
lection of plate, screen, or grid current display; and se­
lection of any one of eleven current-per-division values
-0.02, 0.05, 0.1, 0.2, 0.5,
1,
2, 5, 10, 20, and 50
ma/div. A graticule divides the screen into ten vertical
divisions. Calibration accuracy is within 3"10, permitting
accurate current readings directly from the screen.
Horizontal
A
x
is
-
Either plate or grid voltage can
be displayed on the horizontal axis, and nine voltage­
per-division values ore available-O.l, 0.2, 0. 5,1,2,5,
10, 20, and 50 v/div. Ten horizontal divisions are scrib­
ed on the graticule. Calibration acc�racy is within 3 %,
permitting accurate voltage readings directly from the
screen.
GRID·STEP GENERATOR
Family of Curves--A variable control is provided to
adiust the number of curves in the display. As few as
four and as many os twelve curves can be selected. A
single family con be safely displayed with the tube un­
der heavy overload conditions by means of
a
position on
the STEPS/FAMilY control and a push button. With the
STEPS/FAMilY control in the single-family position,
pressing the button applies the selected conditions to
the tube for only a fraction of second. Use of the SINGLE
FAMilY push button permits observation or photography
of tube characteristics under unusual conditions without
danger of domage to the tube under test.
The STEPS/SEC switch Irontrols the switching-rote of
the step generator. A 120 or 240-steps/sec rate con be
selected. The extra 120-steps/sec position causes switch­
ing to occur at the opposite end of the characteristic
curve, for convenience when the area of interest is at
either end of the curves displayed. (When the Type 570
is used with a 50-cycle supply frequency, the step/sec
rate-will be either 100 or 200. I